US8867089B2 - Recording material transporting device and image forming apparatus - Google Patents
Recording material transporting device and image forming apparatus Download PDFInfo
- Publication number
- US8867089B2 US8867089B2 US13/297,830 US201113297830A US8867089B2 US 8867089 B2 US8867089 B2 US 8867089B2 US 201113297830 A US201113297830 A US 201113297830A US 8867089 B2 US8867089 B2 US 8867089B2
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- US
- United States
- Prior art keywords
- rotating member
- recording material
- sheet
- contact
- rotating
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related, expires
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H9/00—Registering, e.g. orientating, articles; Devices therefor
- B65H9/002—Registering, e.g. orientating, articles; Devices therefor changing orientation of sheet by only controlling movement of the forwarding means, i.e. without the use of stop or register wall
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2220/00—Function indicators
- B65H2220/01—Function indicators indicating an entity as a function of which control, adjustment or change is performed, i.e. input
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2220/00—Function indicators
- B65H2220/04—Function indicators for distinguishing adjusting from controlling, i.e. manual adjustments
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2220/00—Function indicators
- B65H2220/09—Function indicators indicating that several of an entity are present
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2404/00—Parts for transporting or guiding the handled material
- B65H2404/10—Rollers
- B65H2404/13—Details of longitudinal profile
- B65H2404/133—Limited number of active elements on common axis
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2404/00—Parts for transporting or guiding the handled material
- B65H2404/10—Rollers
- B65H2404/14—Roller pairs
- B65H2404/143—Roller pairs driving roller and idler roller arrangement
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2404/00—Parts for transporting or guiding the handled material
- B65H2404/10—Rollers
- B65H2404/14—Roller pairs
- B65H2404/144—Roller pairs with relative movement of the rollers to / from each other
- B65H2404/1442—Tripping arrangements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2511/00—Dimensions; Position; Numbers; Identification; Occurrences
- B65H2511/10—Size; Dimensions
- B65H2511/12—Width
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2801/00—Application field
- B65H2801/03—Image reproduction devices
- B65H2801/06—Office-type machines, e.g. photocopiers
Definitions
- the present invention relates to a recording material transporting device and an image forming apparatus.
- a recording material transporting device including:
- a first transporting unit that includes a first rotating member and a second rotating member being arranged apart from each other in a direction crossing the transport path, the first transporting unit correcting skew of the recording material by rotating the first rotating member and the second rotating member in a different speed;
- a second transporting unit that includes a third rotating member and a fourth rotating member being arranged apart from each other in the crossing direction, the second transporting unit correcting skew of the recording material by rotating the third rotating member and the fourth rotating member in a different speed
- FIG. 1 is a view showing an image forming apparatus as seen from the front side
- FIG. 2 is a view showing second transport rolls as seen from the upstream side in the transport direction of a sheet
- FIG. 3 is a view illustrating an inverting mechanism
- FIG. 4 is a view illustrating the outline of skew correction that is performed by third transport rolls
- FIG. 5 is a view illustrating the details of the third transport rolls
- FIG. 6 is an enlarged perspective view of a portion where first and third contact rolls are provided.
- FIG. 7 is a view showing a state where the third contact roll has moved.
- FIG. 1 is a view showing an image forming apparatus to which this embodiment is applied as seen from the front side.
- An image forming apparatus 100 shown in FIG. 1 has a so-called tandem-type configuration, and includes plural image forming units 10 ( 10 Y, 10 M, 10 C, and 10 K) that form toner images having respective color components by an electrophotographic system. Further, the image forming apparatus 100 according to this embodiment includes a controller 80 that includes a CPU (Central Processing Unit), a ROM (Read Only Memory), and the like and controls the operations of respective devices and sections of the image forming apparatus 100 .
- CPU Central Processing Unit
- ROM Read Only Memory
- the image forming apparatus 100 includes a user interface section (UI) 90 .
- the user interface section (UI) 90 is formed of a display panel; outputs an instruction, which is received from a user, to the controller 80 ; and displays information, which is received from the controller 80 , to a user.
- the image forming apparatus includes a receiving section 70 that receives image data and the like from, for example, a personal computer (PC), an image reading device (scanner), and the like.
- the image forming apparatus 100 includes an intermediate transfer belt 20 and a secondary transfer device 30 .
- the toner images which have the respective color components and are formed by the respective image forming units 10 , are sequentially transferred (primarily transferred) to the intermediate transfer belt 20 , and the intermediate transfer belt 20 holds the toner images.
- the secondary transfer device 30 collectively transfers (secondarily transfers) the toner images, which are held on the intermediate transfer belt 20 , to a sheet P that is an example of a recording material.
- a first sheet transport path R 1 along which a sheet P is transported toward the secondary transfer device 30 passes and a second sheet transport path R 2 along which the sheet P having passed through the secondary transfer device 30 passes are formed in the image forming apparatus 100 .
- a third sheet transport path R 3 is formed on the downstream side of a fixing device 50 (to be described below).
- the third sheet transport path R 3 is branched from the second sheet transport path R 2 and extends to the position below the first sheet transport path R 1 .
- a part of the third sheet transport path R 3 is parallel to the first sheet transport path R 1 .
- an inverting mechanism 500 which transports a sheet P to the first sheet transport path R 1 from the third sheet transport path R 3 , inverts the sheet P, and feeds the sheet P to the first sheet transport path R 1 , is provided in this embodiment.
- an inverting mechanism 500 which inverts a sheet P about an axis along a sheet transport direction of the first sheet transport path R 1 and a sheet transport direction of the third sheet transport path R 3 , is provided in this embodiment.
- an opening 102 is formed at a housing 101 of the image forming apparatus 100 .
- the sheet P transported along the second sheet transport path R 2 is discharged to the outside of the housing 101 through the opening 102 and is stacked on a sheet stacking section (not shown).
- a processing device (not shown) may be provided adjacent to the housing 101 , and processing such as punching may be further performed at the sheet P discharged from the opening 102 .
- the image forming apparatus 100 includes a first sheet feeding device 410 that feeds a sheet P to the first sheet transport path R 1 .
- the image forming apparatus includes a second sheet feeding device 420 that is provided on the upstream side of the first sheet feeding device 410 in the transport direction of a sheet P and feeds a sheet P to the first sheet transport path R 1 .
- first and second sheet feeding devices 410 and 420 have the same configuration.
- Each of the first and second sheet feeding devices 410 and 420 includes a sheet storage section 41 that stores sheets P and a take-out roll 42 that takes out and transports the sheet P stored in the sheet storage section 41 .
- first transport rolls 44 which transport a sheet P positioned on the first sheet transport path R 1 toward the secondary transfer device 30 , is provided on the first sheet transport path R 1 on the upstream side of the secondary transfer device 30 .
- second transport rolls 45 that transport a sheet P toward the first transport rolls 44 are provided on the first sheet transport path R 1 on the upstream side of the secondary transfer device 30 .
- third transport rolls 46 that transport a sheet P toward the second transport rolls 45 are provided on the first sheet transport path R 1 on the upstream side of the secondary transfer device 30 .
- plural transport rolls 48 which transport the sheets P positioned on these sheet transport paths, are provided on the first sheet transport path R 1 , the second sheet transport path R 2 , and the third sheet transport path R 3 .
- each of the first transport rolls 44 , the second transport rolls 45 , the third transport rolls 46 , the fourth transport rolls 47 , and the transport rolls 48 are formed of a pair of roll-like members that are rotatably provided and pressed against each other. One roll-like member is rotationally driven, so that each of the transport rolls transports the sheets.
- a regulating member 300 against which the front end portion of a sheet P is abutted is provided between the second transport rolls 45 and the third transport rolls 46 .
- the front end portion of the sheet P is abutted against the regulating member 300 by the third transport rolls 46 which transports the sheet P toward the regulating member 300 , so that the skew of the sheet P (the inclination of the sheet P to the transport direction) is corrected.
- the regulating member 300 moves toward the downstream side in the transport direction of the sheet P while the front end portion of the sheet P is abutted against the regulating member 300 .
- the regulating member 300 reaches the second transport rolls 45 and moves to the downstream side of the second transport roll 45 .
- the regulating member 300 reaches the second transport rolls 45 , so that the sheet P is delivered to the second transport roll 45 from the regulating member 300 .
- the second transport rolls 45 include two rotating shafts 451 and 452 that are disposed parallel to each other, roll-like members 453 that are mounted on one rotating shaft 451 and rotate together with the one rotating shaft 451 , and roll-like members 454 that are mounted on the other rotating shaft 452 and rotate together with the other rotating shaft 452 .
- the roll-like members 453 and 454 are disposed so as to come into contact with each other, and plural (plural sets of) roll-like members 453 and 454 are provided at different positions in the axial direction of the second transport roll 45 . Further, gaps G are formed between the roll-like members 453 adjacent to each other in the axial direction of the rotating shaft 451 and between the roll-like members 454 adjacent to each other in the axial direction of the rotating shaft 452 .
- a front end portion of the regulating member 300 of this embodiment which is positioned close to the first sheet transport path R 1 , is formed in a comb-teeth shape (not shown).
- the regulating member 300 includes plural protruding portions (not shown), which protrude over the first sheet transport path R 1 , at the front end portion.
- the plural protruding portions are provided so as to be deviated from each other in a direction orthogonal to the transport direction of a sheet P.
- the front end portion of a sheet P is abutted against these protruding portions, so that the skew of the sheet P is corrected.
- the protruding portions move to the downstream side of the second transport roll 45 through the gaps G formed at the second transport rolls 45 . Further, when the protruding portions pass through the gaps G, the sheet P abutted against the protruding portions is delivered to the second transport rolls 45 and the transport of the sheet P performed by the second transport rolls 45 begins.
- the regulating member 300 retreats from the first sheet transport path R 1 .
- the regulating member 300 is displaced so that the protruding portions get out of the first sheet transport path R 1 .
- the regulating member 300 returns to the upstream side in the transport direction of a sheet P and returns onto the first sheet transport path R 1 .
- the protruding portions are displaced so as to protrude over the first sheet transport path R 1 . Accordingly, the skew correction of a sheet P, which is newly transported, may be performed.
- the image forming apparatus 100 will be further described with reference to FIG. 1 again.
- a fixing device 50 is provided on the second sheet transport path R 2 .
- the fixing device 50 fixes images, which have been secondarily transferred to a sheet P by the secondary transfer device 30 , to the sheet P.
- the fixing device 50 includes a heating roll 50 A that is heated by a built-in heater (not shown) and a pressing roll 50 B that presses the heating roll 50 A.
- a sheet P is heated and pressed by passing between the heating roll 50 A and the pressing roll 50 B. Accordingly, images transferred to the sheet P are fixed to the sheet P.
- a transporting device 51 which transports the sheet P having passed through the secondary transfer device 30 to the fixing device 50 , is provided between the secondary transfer device 30 and the fixing device 50 .
- the transporting device 51 includes a revolving belt 51 A, and transports a sheet P while the sheet P is placed on the belt 51 A.
- each of the image forming units 10 functioning as a part of an image forming section includes a photoreceptor drum 11 that is rotatably mounted. Further, a charging device 12 that charges the photoreceptor drum 11 , an exposure device 13 that writes an electrostatic latent image by exposing the photoreceptor drum 11 , and a developing device 14 that changes the electrostatic latent image formed on the photoreceptor drum 11 to a visible image are provided around the photoreceptor drum 11 . Furthermore, a primary transfer device 15 and a drum cleaning device 16 are provided around the photoreceptor drum 11 . The primary transfer device 15 transfers the toner images, which have the respective color components and are formed on the photoreceptor drum 11 , to the intermediate transfer belt 20 . The drum cleaning device 16 removes toner remaining on the photoreceptor drum 11 .
- the intermediate transfer belt 20 is stretched by three roll-like members 21 to 23 and provided so as to rotate.
- the roll-like member 22 is adapted to drive the intermediate transfer belt 20 .
- the roll-like member 23 is disposed so as to face a secondary transfer roller 31 with the intermediate transfer belt 20 interposed therebetween.
- the secondary transfer roller 31 and the roll-like member 23 form the secondary transfer device 30 .
- a belt cleaning device 24 which removes toner remaining on the intermediate transfer belt 20 , is provided at the position that faces the roll-like member 21 with the intermediate transfer belt 20 interposed therebetween.
- the image forming apparatus 100 it is possible to form images on a first surface of a sheet P, which is fed from the first sheet feeding device 410 or the like, and to form images on a second surface of the sheet P. More specifically, in the image forming apparatus 100 , a sheet P having passed through the fixing device 50 is inverted by the inverting mechanism 500 and the inverted sheet P is transported to the secondary transfer device 30 again. Further, images are transferred to the second surface of the sheet P by the secondary transfer device 30 . After that, the sheet P passes through the fixing device 50 again, and the transferred images are fixed to the sheet P. Accordingly, images are formed not only on the first surface of the sheet P but also on the second surface.
- FIG. 3 is a view illustrating the inverting mechanism 500 .
- the plural transport rolls 48 which transport a sheet P along the third sheet transport path R 3 , are provided on the third sheet transport path R 3 . Further, the plural transport rolls 48 , which transport a sheet P along the first sheet transport path R 1 , are provided even on the first sheet transport path R 1 . Furthermore, transport rolls 91 , which transport a sheet P in a direction orthogonal to (a direction crossing) the transport direction of the sheet P on the third sheet transport path R 3 , are provided on the third sheet transport path R 3 . In other words, transport rolls 91 , which transport a sheet P toward the side of the third sheet transport path R 3 , are provided on the third sheet transport path.
- a guide member 92 which guides a sheet P so that a sheet P transported by the transport rolls 91 moves upward and the sheet P having moved upward further moves toward the first sheet transport path R 1 , is provided in this embodiment.
- transport rolls 93 are provided in this embodiment. The transport rolls 93 nip a sheet P, which is guided by the guide member 92 and of which the front end portion faces upward, and further transport the sheet P upward.
- transport rolls 94 which transport the sheet P transported by the transport rolls 93 to a predetermined position on the first sheet transport path R 1 , are provided on the first sheet transport path R 1 .
- driving motors (not shown), which drive the transport rolls 48 , the transport rolls 91 , the transport rolls 93 , and the transport rolls 94 , are provided in this embodiment. Meanwhile, each of the driving motors is formed of a stepping motor.
- each of the transport rolls 48 are formed of a pair of roll-like members as described above. Further, each of the transport rolls 91 , the transport rolls 93 , and the transport rolls 94 are formed of a pair of roll-like members that are pressed against each other. Meanwhile, only one roll-like member of each of the pairs of roll-like members of the transport rolls 48 , the transport rolls 91 , the transport rolls 93 , and the transport rolls 94 are shown in FIG. 3 .
- one roll-like member of the transport rolls 48 is adapted so as to be capable of being separated from the other roll-like member thereof.
- one roll-like member of each of the transport rolls 91 and the transport rolls 94 is adapted so as to be capable of being separated from the other roll-like member thereof.
- a separation mechanisms (not shown), which separates one roll-like member of each of these rolls from the other roll-like members thereof, are provided. Meanwhile, each of the separation mechanisms is formed by existing techniques that use a motor, cams, and the like.
- a sheet P is transported along the third sheet transport path R 3 by the transport rolls 48 . Meanwhile, at this time, one roll-like member of each of the transport rolls 91 provided on the third sheet transport path R 3 is separated from the other roll-like member thereof. Then, one roll-like member of each of the transport rolls 48 is separated from the other roll-like member thereof, and one roll-like member of each of the transport rolls 91 is pressed against the roll-like member thereof with the sheet P interposed therebetween.
- the transport rolls 91 and the transport rolls 93 are rotationally driven. Further, the transport rolls 94 are also rotationally driven. Accordingly, the sheet P is transported toward the first sheet transport path R 1 . Meanwhile, at this time, one roll-like member of each of the transport rolls 48 provided on the first sheet transport path R 1 is separated from the other roll-like members thereof. Further, when the sheet P is transported to a predetermined position on the first sheet transport path R 1 , the rotational drive of the transport rolls 91 , the transport rolls 93 , and the transport rolls 94 is stopped.
- the transport rolls 48 are rotationally driven, so that the sheet P is transported along the first sheet transport path R 1 . Meanwhile, at this time, the sheet P has been already inverted.
- the inverting mechanism 500 of this embodiment the front and rear end portions of the sheet P in the transport direction are not reversed and the sheet P is inverted. Meanwhile, in the inverting mechanism 500 of this embodiment, one side and the other side of the sheet are reversed.
- the front end portion of a sheet P is abutted against the regulating member 300 , so that the skew of the sheet P is corrected.
- the third transport rolls 46 are also used to perform skew correction.
- second skew correction is performed by the regulating member 300 after first skew correction is performed by the third transport rolls 46 . Accordingly, the skew correction of a sheet P is more reliably performed as compared to the structure that performs skew correction once.
- FIG. 4 is a view illustrating the outline of the skew correction that is performed by the third transport rolls 46 .
- the third transport rolls 46 are provided with first and second driving rollers 46 A and 46 B.
- the first and second driving rollers 46 A and 46 B are disposed below a sheet P transported along the first sheet transport path R 1 , rotate while coming into contact with the sheet P, and move the sheet P to the downstream side.
- the first driving roller 46 A as an example of a first rotating member is disposed on one side of one side and the other side that face each other with a reference position interposed therebetween.
- the middle portion of the sheet P (the middle portion of the sheet in the direction orthogonal to the sheet transport direction) is planned to pass through the reference position.
- the second driving roller 46 B as an example of a second rotating member is disposed on the other side of one side and the other side.
- the first and second driving rollers 46 A and 46 B are provided so as to be deviated from each other in the direction orthogonal to (crossing) the transport direction of the sheet P.
- the rotating speed of one driving roller of the first and second driving rollers 46 A and 46 B is reduced as compared to the rotating speed of the other driving roller (the rotating speed of the first driving roller 46 A is reduced in an example shown in FIG. 4 ).
- the rotating speed of the driving roller corresponding to an advanced portion of the sheet P is reduced.
- a portion of the sheet P, which comes into contact with the driving roller having low rotating speed, (the advanced portion of the sheet P) becomes slower than a portion of the sheet that comes into contact with the driving roller having high rotating speed, so that the skew of the sheet P is reduced.
- the sheet P is displaced so that an angle between the side (the side parallel to the transport direction) of the sheet P, which is being transported, and the transport direction of the sheet P is reduced. Accordingly, the skew of the sheet P is reduced.
- first and second sensors S 1 and S 2 which detect the front end portion of the transported sheet P, are provided on the downstream side of the first and second driving rollers 46 A and 46 B in the transport direction of a sheet P.
- the first and second sensors S 1 and S 2 are disposed on one line orthogonal to the transport direction of a sheet P.
- the first and second sensors S 1 and S 2 are disposed so as to be deviated from each other in a direction orthogonal to the transport direction of a sheet P.
- each of the first and second sensors S 1 and S 2 may be formed of, for example, a so-called reflective sensor that includes a light-emitting element and a light-receiving element.
- the rotating speed of the first driving roller 46 A is reduced by the detection, which is performed by the second sensor S 2 , as a trigger.
- the rotating speed of the second driving roller 46 B is reduced after the front end portion of the sheet is detected by the second sensor S 2 and a predetermined time passes.
- the rotating speed of the second driving roller 46 B is made equal to the rotating speed of the first driving roller 46 A. Accordingly, the skew correction of the sheet P is completed and the sheet P moves toward the regulating member 300 (see FIG. 1 ) while maintaining a constant attitude.
- the rotating speed of the second driving roller 46 B is reduced when a predetermined time passes after the front end portion of the sheet is detected by the second sensor S 2 .
- This predetermined time is determined on the basis of a time that passes until the front end portion of the sheet is detected by the second sensor S 2 after the front end portion of the sheet is detected by the first sensor S 1 .
- the controller 80 determines the above-mentioned predetermined time on the basis of the time difference between the timing when the front end portion of the sheet P is detected by the first sensor S 1 and the timing when the front end portion of the sheet P is detected by the second sensor S 2 .
- the skew of the sheet P is large and the predetermined time is determined to be long. Further, if the time difference is small, the skew of the sheet P is small and the predetermined time is determined to be short.
- the time difference between the timing when the front end portion of the sheet P is detected by the first sensor S 1 and the timing when the front end portion of the sheet P is detected by the second sensor S 2 is used in this embodiment, the amount of skew of the sheet P (the amount of the inclination of the sheet P to the sheet transport direction) is detected by the controller 80 as an example of an inclination amount detecting unit. Further, the predetermined time is determined on the basis of the detected amount of the skew.
- the rotating speed of one driving roller corresponding to a lagging portion of the sheet P may be increased, and the rotating speed of the other driving roller may be increased after a predetermined time passes. Meanwhile, in this case, the transport speed of the sheet P is increased after the sheet P passes through the third transport rolls 46 .
- a sheet P is abutted against the regulating member 300 after passing through the third transport rolls 46 (see FIG. 1 ).
- the transport speed of the sheet P is increased as described above after the sheet P passes through the third transport rolls 46 , the front end portion of the sheet P is apt to be damaged when the sheet P comes into contact with the regulating member 300 .
- the skew correction of the sheet P is performed by the reduction of the rotating speed of the driving roller without the increase of the rotating speed of the driving roller.
- FIG. 5 is a view illustrating the details of the third transport rolls 46 .
- FIG. 5 is a view showing third transport rolls 46 as seen from the upstream side in the transport direction of a sheet P.
- the third transport rolls 46 will be further described with reference to FIG. 5 .
- the third transport rolls 46 are provided with a first shaft 46 S.
- the first shaft 46 S is provided along a direction orthogonal to the transport direction of a sheet P, is rotatably provided, and supports the first driving roller 46 A.
- the third transport rolls 46 are provided with a second shaft 46 T.
- the second shaft 46 T is provided along the direction orthogonal to the transport direction of the sheet P, is rotatably provided, and supports the second driving roller 46 B.
- a first motor M 1 that rotationally drives the first shaft 46 S as an example of a first rotating shaft
- a transmission gear train 46 U that transmits a drive force from the first motor M 1 to the first shaft 46 S
- a second motor M 2 that rotationally drives the second shaft 46 T as an example of a second rotating shaft
- a transmission gear train 46 W that transmits a drive force from the second motor M 2 to the second shaft 46 T
- third and fourth driving rollers 46 C and 46 D are provided between the first and second driving rollers 46 A and 46 B.
- the third driving roller 46 C is provided closer to the first driving roller 46 A than the second driving roller 46 B
- the fourth driving roller 46 D is provided closer to the second driving roller 46 B than the first driving roller 46 A.
- the third driving roller 46 C as an example of a third rotating member is supported by the first shaft 46 S
- the fourth driving roller 46 D as an example of a fourth rotating member is supported by the second shaft 46 T.
- the third and fourth driving rollers 46 C and 46 D are provided so as to be deviated from each other in the direction orthogonal to (crossing) the transport direction of the sheet P.
- a first contact roll 46 G is provided in this embodiment.
- the first contact roll 46 G is provided so as to come into contact with the first driving roller 46 A, is rotated by a drive force transmitted from the first driving roller 46 A, and moves a sheet P, which is transported to a contact portion between the first driving roller 46 A and itself, to the downstream side together with the first driving roller 46 A.
- a second contact roll 46 H is provided in this embodiment.
- the second contact roll 46 H is provided so as to come into contact with the second driving roller 46 B, is rotated by a drive force transmitted from the second driving roller 46 B, and moves a sheet P, which is transported to a contact portion between the second driving roller 46 B and itself, to the downstream side together with the second driving roller 46 B.
- a sheet P is pressed against the first and second driving rollers 46 A and 46 B by the first and second contact rolls 46 G and 46 H when skew correction is performed by the first and second driving rollers 46 A and 46 B. Accordingly, a slip does not easily occur between the sheet P and the first driving roller 46 A and a slip does not easily occur between the sheet P and the second driving roller 46 B.
- a third contact roll 46 J is provided in this embodiment.
- the third contact roll 46 J is provided so as to come into contact with the third driving roller 46 C, is rotated by a drive force transmitted from the third driving roller 46 C, and moves a sheet P, which is transported to a contact portion between the third driving roller 46 C and itself, to the downstream side together with the third driving roller 46 C.
- a fourth contact roll 46 K is provided in this embodiment.
- the fourth contact roll 46 K is provided so as to come into contact with the fourth driving roller 46 D, is rotated by a drive force transmitted from the fourth driving roller 46 D, and moves a sheet P, which is transported to a contact portion between the fourth driving roller 46 D and itself, to the downstream side together with the fourth driving roller 46 D.
- skew of a sheet P is corrected by the reduction of the rotating speed of one driving roller of the first and second driving rollers 46 A and 46 B.
- sheets having various sizes there are sheets having various sizes as the sheet P.
- the sheet P passes between the first and second driving rollers 46 A and 46 B and the skew of the sheet P may not be corrected.
- the third and fourth driving rollers 46 C and 46 D are provided between the first and second driving rollers 46 A and 46 B so that the skew of the sheet P having a small size is also corrected.
- the skew of a sheet P having a small size may be corrected even if the third and fourth driving rollers 46 C and 46 D are not provided.
- the skew of a sheet P having a large size is corrected in this case, cockles, tracks, or the like are apt to be formed on the sheet P.
- the first and second driving rollers 46 A and 46 B are provided close to each other, accuracy is apt to deteriorate at the time of the skew correction when the skew of a sheet P having a large size is corrected.
- the third and fourth driving rollers 46 C and 46 D are provided between the first and second driving rollers 46 A and 46 B so that the skew correction of a sheet P having a small size is performed by the third and fourth driving rollers 46 C and 46 D. Meanwhile, the skew correction performed by the third and fourth driving rollers 46 C and 46 D is the same as the above-mentioned skew correction performed by the first and second driving rollers 46 A and 46 B.
- the two first and second sensors S 1 and 32 shown in FIG. 4 are disposed close to each other in order to be capable of detecting the front end portion of a sheet P having a small size. Meanwhile, when a distance between the two sensors is large, it is possible to more accurately detect the amount of skew of a sheet P as compared to a case where a distance between the two sensors is small. For this reason, as shown in FIG. 4 , the third and fourth sensors S 3 and S 4 between which the distance is larger than the distance between the first and second sensors S 1 and S 2 may be provided in addition to the first and second sensors S 1 and S 2 .
- the amount of skew of a sheet P (a sheet P having a small size) of which the skew is corrected by the third and fourth driving rollers 46 C and 46 D is detected by the first and second sensors S 1 and S 2 . Further, the amount of skew of a sheet P (a sheet P having a large size) of which the skew is corrected by the first and second driving rollers 46 A and 46 B is detected by the third and fourth sensors S 3 and S 4 . Meanwhile, the size of a sheet P to be transported is detected by the controller 80 (see FIG. 1 ) functioning as a size acquisition unit. More specifically, the controller 80 acquires the size of a sheet P on the basis of information that is input through the UI 90 by a user, or information that is sent from a PC (not shown) together with image information.
- the third contact roll 46 J as an example of a first contact member is adapted to be capable of approaching and retreating from the third driving roller 46 C, so that the third contact roll 46 J can be separated from the third driving roller 46 C as shown by a broken line of FIG. 5 .
- the fourth contact roll 46 K as an example of a second contact member is adapted to be capable of approaching and retreating from the fourth driving roller 46 D, so that the fourth contact roll 46 K can be separated from the fourth driving roller 46 D.
- the approach and retreat of the third and fourth contact rolls 46 J and 46 K are manually performed by a user (the details will be described below). Meanwhile, a case where the third and fourth contact rolls 46 J and 46 K are adapted to be movable has been described in this embodiment. However, the third and fourth driving rollers 46 C and 46 D may be adapted to be movable.
- FIG. 6 is an enlarged perspective view of a portion where the first and third contact rolls 46 G and 46 J are provided.
- FIG. 6 is an enlarged perspective view of a portion A of FIG. 5 .
- FIG. 6 shows the portion where the first and third contact rolls 46 G and 46 J are provided.
- the portion where the second and fourth contact rolls 46 H and 46 K are provided also has the same configuration as the configuration of the portion where the first and third contact rolls 46 G and 46 J are provided.
- a support unit 60 supporting the first and third contact rolls 46 G and 46 J is provided in this embodiment. Meanwhile, the support unit 60 is pushed toward the portion, where the first driving roller 46 A (see FIG. 5 ) and the third driving roller 46 C are provided, by a torsion spring (not shown). Further, the first contact roll 46 G is pressed against the first driving roller 46 A and the third contact roll 46 J is pressed against the third driving roller 46 D by this pushing.
- the support unit 60 includes a gear 61 , a shaft (not shown), a first oscillating arm 621 , and a second oscillating arm 622 .
- a tooth portion (not shown) is formed on the outer peripheral surface of the gear 61 , and the gear 61 is rotated by a drive force transmitted from a driving motor (not shown).
- the shaft (not shown) is provided so as to pass through the gear 61 , is provided at the gear 61 so as to be parallel to the thickness direction, and is fixed to the gear 61 .
- One end of the first oscillating arm 621 is fixed to one end portion of the shaft, and the third contact roll 46 J is fixed to the other end of the first oscillating arm.
- One end of the second oscillating arm 622 is fixed to the other end portion of the shaft, and the first contact roll 46 G is fixed to the other end of the second oscillating arm 622 .
- a positioning member 63 which is used to position the first oscillating arm 621 , is provided between the first oscillating arm 621 and the gear 61 .
- the positioning member 63 is formed in the shape of a disk, and includes a first protrusion 631 and a second protrusion 632 (which is not shown in FIG. 6 and will be described below) of which end portions are formed in a round shape and which are formed on the surface of the positioning member where the first oscillating arm 621 is provided.
- the first oscillating arm 621 has a predetermined thickness and is formed in the shape of a plate. Further, the first oscillating arm 621 includes a protruding portion 65 protruding from a surface 64 , which is positioned at the upper portion in FIG. 6 , of four side surfaces thereof.
- the protruding portion 65 protrudes from the side surface 64 , and includes a base portion 651 that is disposed perpendicular to the side surface 64 .
- a finger catch 652 is formed at the protruding portion 65 .
- the finger catch 652 is connected to the base portion 651 , is disposed so as to cross the base portion 651 , is disposed so as to have a gap between the side surface 64 and itself, and catches a user's finger.
- the finger catch 652 is pulled upward in FIG. 6 after a user's finger is caught by the finger catch 652 . Accordingly, as shown in FIG. 7 (a view showing a state where the third contact roll 46 J has moved), the third contact roll 46 J is displaced upward and the third contact roll 46 J is separated from the third driving roller 46 C (see FIG. 5 ).
- the first oscillating arm 621 when the first oscillating arm 621 is rotated to a predetermined position, the first protrusion 631 formed on the positioning member 63 enters a through hole 69 formed at the first oscillating arm 621 as shown in FIG. 7 . Accordingly, the movement (rotation) of the first oscillating arm 621 is restricted, so that the third contact roll 46 J is stayed at a predetermined position. Meanwhile, when the third contact roll 46 J is disposed so as to be pressed against the third driving roller 46 C, the second protrusion 632 (see FIG. 7 ) formed on the positioning member 63 enters the through hole 69 of the first oscillating arm 621 . Even in this case, the third contact roll 46 J is stayed at a predetermined position.
- the nip of a sheet P performed by the third transport rolls 46 is released after the sheet P begins to be transported by the second transport roll 45 (see FIG. 1 ).
- the first contact roll 46 G, the second contact roll 46 H, the third contact roll 46 J, and the fourth contact roll 46 K are separated from the corresponding driving rollers.
- the restriction of the rear end portion of a sheet P performed by the third transport rolls 96 is released. Accordingly, the skew of a sheet P or the tension of a sheet P, which is caused by the restriction performed by the third transport rolls 46 , is suppressed.
- the gear 61 shown in FIG. 6 is rotated in the counterclockwise direction in FIG. 6 by the drive of a motor (not shown), so that the first contact roll 46 G, the second contact roll 46 H, the third contact roll 46 J, and the fourth contact roll 46 K are displaced upward.
- the first contact roll 46 G, the second contact roll 46 H, the third contact roll 46 J, and the fourth contact roll 46 K are separated from the corresponding driving rollers.
- a protruding piece 67 that protrudes from the outer peripheral surface of the gear 61 and a detection sensor (not shown) that detects the protruding piece 67 are provided in order to detect the states of the first contact roll 46 G, the second contact roll 46 H, the third contact roll 46 J, and the fourth contact roll 46 K (in order to detect whether the first contact roll 96 G, the second contact roll 46 H, the third contact roll 46 J, and the fourth contact roll 46 K come into contact with the driving rollers).
- the third and fourth contact rolls 46 J and 46 K when the third and fourth contact rolls 46 J and 46 K are manually moved as in this embodiment, the third and fourth contact rolls 46 J and 46 K may come into contact with the corresponding driving rollers despite the transport of a sheet P having a large size. Further, when the third and fourth contact rolls 46 J and 46 K are manually moved, the third and fourth contact rolls 46 J and 46 K may not come into contact with the corresponding driving rollers despite the transport of a sheet P having a small size. For this reason, a sensor (not shown) for detecting the positions of the third and fourth contact rolls 46 J and 46 K and a detection piece 66 to be detected by the sensor are provided in this embodiment as shown in FIGS. 6 and 7 .
- the detection piece 66 is formed at the first oscillating arm 621 , the positions of the third and fourth contact rolls 46 J and 46 K are detected by whether or not the detection piece 66 formed at the first oscillating arm 621 is detected by the sensor. Specifically, in this embodiment, the detection piece 66 is detected by the sensor when the third and fourth contact rolls 46 J and 46 K come into contact with the corresponding driving rollers, and the detection piece 66 is not detected by the sensor when the third and fourth contact rolls 46 J and 46 K do not come into contact with the corresponding driving rollers.
- the fact that the third and fourth contact rolls 46 J and 46 K need to be separated from the corresponding driving rollers may be displayed on the UI 90 (see FIG. 1 ).
- a display for making a user perform an operation for separating the third and fourth contact rolls 46 J and 46 K from the corresponding driving rollers may be displayed on the UI 90 .
- the fact that the third and fourth contact rolls 46 J and 46 K need to come into contact with the corresponding driving rollers may be displayed on the UI.
- a display for making a user perform an operation for making the third and fourth contact rolls 46 J and 46 K come into contact with the corresponding driving rollers may be displayed on the UI 90 .
- an image of the finger catch 652 of the first oscillating arm 621 be displayed on the UI 90 and an actual operating position be displayed to a user.
- the display on the UI 90 may be switched to other displays. More specifically, the display on the UI may be switched to the display that is used to receive various conditions, when an image is formed on, for example, a sheet P having a small size, from a user from the display that is used to receive various conditions, when an image is formed on, for example, a sheet P having a large size, from a user.
- the display on the UI 90 may be switched to other displays. More specifically, the display on the UI may be switched to the display that is used to receive various conditions, when an image is formed on, for example, a sheet P having a large size, from a user from the display that is used to receive various conditions, when an image is formed on, for example, a sheet P having a small size, from a user.
- the approach and retreat of the third and fourth contact rolls 46 J and 46 K are not limited to manual approach and retreat, and may be performed by a drive source such as a motor.
- a drive source such as a motor.
- the third and fourth contact rolls 46 J and 46 K come into contact with the corresponding driving rollers despite the transport of a sheet P having a large size
- the third and fourth contact rolls 46 J and 46 K are separated from the corresponding driving rollers by the drive source as an example of a moving unit.
- an example of the image forming apparatus 100 has been described above.
- the above-mentioned configuration may also be applied to processing devices that perform processing, such as binding, for example, staple binding, punching, and embossing, on sheets P.
- control of skew correction when the skew of a sheet P having a large size is corrected by the first and second driving rollers 46 A and 46 B be different from the control of skew correction when the skew of a sheet P having a small size is corrected by the third and fourth driving rollers 46 C and 46 D.
- the rotation angle (displacement) of a sheet P is larger than the rotation angle of a sheet P that is rotated by the first and second driving rollers 46 A and 46 B.
- the state of the sheet of which the skew has been corrected by the first and second driving rollers 46 A and 46 B is different from the state of the sheet of which the skew has been corrected by the third and fourth driving rollers 46 C and 46 D.
- the control of skew correction when skew is corrected by the first and second driving rollers 46 A and 46 B be different from the control of skew correction when skew is corrected by the third and fourth driving rollers 46 C and 46 D.
- the time of skew correction performed by the first and second driving rollers 46 A and 46 B be longer than the time of skew correction performed by the third and fourth driving rollers 46 C and 46 D.
- first driving roller 46 A, the second driving roller 46 B, the third driving roller 46 C, and the fourth driving roller 46 D are provided parallel to one direction orthogonal to the transport direction of a sheet P.
- the disposition of the driving rollers is not limited to this disposition, and the first driving roller 46 A, the second driving roller 46 B, the third driving roller 46 C, and the fourth driving roller 46 D may be provided so as to be deviated from each other in the transport direction of a sheet P.
- first driving roller 46 A, the second driving roller 46 B, the third driving roller 46 C, and the fourth driving roller 46 D are provided in one direction
- the first and third driving rollers 46 A and 46 C can be coaxially provided and the second and fourth driving rollers 46 B and 46 D can be coaxially provided as in this embodiment.
- four drive sources do not need to be provided so as to correspond to the first driving roller 46 A, the second driving roller 46 B, the third driving roller 46 C, and the fourth driving roller 46 D.
Landscapes
- Registering Or Overturning Sheets (AREA)
- Paper Feeding For Electrophotography (AREA)
- Delivering By Means Of Belts And Rollers (AREA)
Abstract
Description
Claims (13)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2011-117191 | 2011-05-25 | ||
JP2011117191A JP5849437B2 (en) | 2011-05-25 | 2011-05-25 | Recording material conveying apparatus and image forming apparatus |
Publications (2)
Publication Number | Publication Date |
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US20120300261A1 US20120300261A1 (en) | 2012-11-29 |
US8867089B2 true US8867089B2 (en) | 2014-10-21 |
Family
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Application Number | Title | Priority Date | Filing Date |
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US13/297,830 Expired - Fee Related US8867089B2 (en) | 2011-05-25 | 2011-11-16 | Recording material transporting device and image forming apparatus |
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US (1) | US8867089B2 (en) |
JP (1) | JP5849437B2 (en) |
Families Citing this family (1)
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JP2022187115A (en) * | 2021-06-07 | 2022-12-19 | キヤノン株式会社 | image forming device |
Citations (6)
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JPH0270639A (en) | 1988-09-02 | 1990-03-09 | Hitachi Ltd | Device and method for correcting paper sheet diagonal feed and paper sheet conveyer |
US5374053A (en) | 1994-01-21 | 1994-12-20 | Heidelberger Druckmaschinen Ag | Device for changing the transport position of products |
JP2006256803A (en) | 2005-03-17 | 2006-09-28 | Ricoh Co Ltd | Image forming device |
US20080230986A1 (en) * | 2003-03-24 | 2008-09-25 | Fuji Xerox Co., Ltd. | Sheet transporting apparatus and sheet processing apparatus using the same |
JP2009221021A (en) | 2008-03-17 | 2009-10-01 | Heidelberger Druckmas Ag | Device for aligning sheets by stopper disposed to body |
US20100109226A1 (en) * | 2008-11-06 | 2010-05-06 | Kabushiki Kaisha Toshiba | auto document feeding device |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2004292107A (en) * | 2003-03-27 | 2004-10-21 | Mutoh Ind Ltd | Paper carrying device |
JP2006036435A (en) * | 2004-07-26 | 2006-02-09 | Canon Inc | Sheet carrying device and image forming device |
JP2007186291A (en) * | 2006-01-12 | 2007-07-26 | Canon Inc | Sheet conveyance device, sheet conveyance method, image forming device, and image reading device |
-
2011
- 2011-05-25 JP JP2011117191A patent/JP5849437B2/en not_active Expired - Fee Related
- 2011-11-16 US US13/297,830 patent/US8867089B2/en not_active Expired - Fee Related
Patent Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
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JPH0270639A (en) | 1988-09-02 | 1990-03-09 | Hitachi Ltd | Device and method for correcting paper sheet diagonal feed and paper sheet conveyer |
US5039086A (en) | 1988-09-02 | 1991-08-13 | Hitachi, Ltd. | Method and apparatus for adjusting posture of sheets |
US5374053A (en) | 1994-01-21 | 1994-12-20 | Heidelberger Druckmaschinen Ag | Device for changing the transport position of products |
JPH07215545A (en) | 1994-01-21 | 1995-08-15 | Heidelberger Druckmas Ag | Device to change carrying position of article |
US20080230986A1 (en) * | 2003-03-24 | 2008-09-25 | Fuji Xerox Co., Ltd. | Sheet transporting apparatus and sheet processing apparatus using the same |
JP2006256803A (en) | 2005-03-17 | 2006-09-28 | Ricoh Co Ltd | Image forming device |
JP2009221021A (en) | 2008-03-17 | 2009-10-01 | Heidelberger Druckmas Ag | Device for aligning sheets by stopper disposed to body |
US20090250869A1 (en) | 2008-03-17 | 2009-10-08 | Heidelberger Druckmaschinen Aktiengesellschaft | Apparatus for aligning sheets through the use of stops disposed on a cylinder |
US20100109226A1 (en) * | 2008-11-06 | 2010-05-06 | Kabushiki Kaisha Toshiba | auto document feeding device |
Also Published As
Publication number | Publication date |
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US20120300261A1 (en) | 2012-11-29 |
JP2012246077A (en) | 2012-12-13 |
JP5849437B2 (en) | 2016-01-27 |
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